docs(readme): center Evolver title

Author: autogame-17

README.md

@@ -2,7 +2,7 @@
   <img src="assets/logo.png" alt="Evolver" width="96" height="96" />
 </p>
 
-# Evolver — Agent Self-Evolving Engine
+<h1 align="center">Evolver — Agent Self-Evolving Engine</h1>
 
 <p align="center">
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